Trim Function in C/VC++

[Chris]

Can anyone show me the available Trim function in C/VC++ or any equavalent function

regards,

[kedaman]

Dunno if there is one, here's something i made just for you

void Trim(char*,char*,char*);
void Trim(char* infirst, char* inlast,char* out){
    for(;(infirst<inlast)&&(*inlast==0);--inlast);
    for(;(infirst<inlast)&&(*infirst==32);++infirst);
    for(;(infirst<inlast)&&(*inlast==32);--inlast);
    for(;(infirst<=inlast);out++)*out=*infirst++;
    *out=0;
}


int main(int argc, char* argv[])
{
    char text[8]=" Chris ";
    char text2[8];
    Trim(&text[0],&text[7],&text2[0]);
    cout << text2;
    return 0;
} 

[Chris]

Thx Keda for you prompt reply. Mean while, I also get some sample code from PlanetSouceCode

wchar_t* LTrim(wchar_t* s)
{
    //**************************************
    //     
    // Name: strrtrim
    // Description:Removes trailing spaces from the end of a string. See "trim" (Rename to "LTrim") to remove leading spaces.
    // By: Man In Limbo
    //
    // Inputs:the string
    //
    // Returns:the trimmed string
    //
    // This code is copyrighted and has// limited warranties.Please see [url]http://www.Planet-Source-Code.com/xq/ASP/txtCodeId.233/lngWId.3/qx/vb/scripts/ShowCode.htm[/url] ::for details.
    //     
    //**************************************
    
    // strrtrim : removes trailing spaces from the end of a string
    int i;

    if (s) 
    {
        i = wcslen(s);
        while ((--i)>0 && iswspace(s[i]) ) s[i]=0;
    }
    return s;
}

wchar_t* RTrim(wchar_t* s)
{
    //**************************************
    //     
    // Name: trim
    // Description:Strips spaces from front of string. Also see strrtrim (Rename to "LTrim")to remove the spaces off the end.
    // By: Man In Limbo
    //
    // Inputs:The String
    //
    // Returns:The Trimmed String.
    //
    // This code is copyrighted and has// limited warranties.
    // Please see [url]http://www.Planet-Source-Code.com/xq/ASP/txtCodeId.232/lngWId.3/qx/vb/scripts/ShowCode.htm[/url] ::for details.
    //     
    //**************************************

    // trim : scan over spaces from the front of a string.

    if (s)
    {
        while (iswspace(*s)) s++; 
    }

    return s;
} 

regards,

[kedaman]

that's nullchars not spaces, besides you can hardly use them in conjunction to function as Trim.

[parksie]

Is this allowed?

tstring Trim(tstring sIn) {
	int i, start = -1, end = -1;

	for(i = 0; i < sIn.length(); i++) {
		if(_istspace(sIn[i])) start = i;
		else {
			sIn = sIn.substr(i, sIn.length() - i);
			break;
		}
	}

	for(i = sIn.length()-1; i >= 0; i--) {
		if(_istspace(sIn[i])) end = i;
		else {
			sIn = sIn.substr(0, i+1);
			break;
		}
	}
	
	return sIn;
}

[kedaman]

Dunno, but looks very heavy to me :/

[parksie]

A bit, yeah. The advantage is that it works a treat, stripping off newlines, tabs, and spaces And it calls .substr a maximum of twice

[kedaman]

oh yeah and it's so heavy it makes me throw up

[parksie]

Git

If I could really be bothered I might write a faster one

[kedaman]

hehe, you should learn to use the power in C++
May the Force be with you

[parksie]

Speed wasn't a priority in that one, but I accept your challenge

[Chris]

I think those written app with C++ is 'coz of the speed & power of control everthing. Juz like me choose VC++ to write app in WinCE.

by the way, thanks for both of you sample code & it help very much.

Originally posted by parksie
Speed wasn't a priority in that one, but I accept your challenge

[CornedBee]

tell me one thing kedaman
why do you keep using the ascii codes of the letters. It's not as if ' ' or '\0' was any slower (resolved by the compiler) and it is far more readable.

All the buzzt
CornedBee

[kedaman]

kinda old habit since i used vb